Arm chair



FIG. 1 is a perspective view of my arm chair;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a close-up front view of the ornament at the top center portion of my arm chair.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for an arm chair, as shown and described. 